The Aku Custom Fit IMS Insoles are part of Aku'sInternal Midsole System which is an exclusive technology used by AKU in the construction of the insole, which combines the traditional nylon support structure with an EVA microporous layer positioned inside the upper. This system allows the footbed to perfectly capture the anatomy of the foot, guarantees an even distribution of pressure, prevents lateral and frontal slippage during intense use and offers both shock absorption and excellent wearing comfort.

These are already provided in each pair of AKu Boots and are for wearers to replace after 6-12 months of use to allow a new again feel to the wearer.